EVENT 423 Open/Male 50m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Harry Johnson | 15 | Saffron Wald | |
| 4 | 3 | Oliver Fenwick | 15 | Team Luton | |
| 5 | 2 | Jack Peters | 15 | Basildon Ph | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Theo Smith | 15 | Hitchin | |
| 2 | 7 | Joseph Elliott | 15 | Flitwick | |
| 3 | 9 | Berkley Barnicoat | 15 | Bedford SS | |
| 4 | 11 | Volodymyr Ignatiev | 15 | Bishop Stort | |
| 5 | 10 | Fabien John | 15 | Hoddesdon | |
| 6 | 8 | Ramsey Gill | 15 | Co St Albans | |
| 7 | 6 | Nonso Nwabueze | 15 | Bo Southend | |
| 8 | 4 | Toby Flood | 15 | Thetford | |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 13 | Joshua Jones | 15 | West Norfolk | |
| 2 | 15 | Sebastian Reynolds | 16 | Hadleigh | |
| 3 | 17 | Thomas Baxter | 15 | West Norfolk | |
| 4 | 19 | Zilvinas Simkus | 16 | Co Peterboro | |
| 5 | 18 | Connor Rickard | 16 | March | |
| 6 | 16 | Lee Boka | 16 | Basildon Ph | |
| 7 | 14 | Jeremy Godwin | 15 | Thurrock | |
| 8 | 12 | Lucas Moxon-Booth | 15 | Flitwick | |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 21 | Theodore Monk | 16 | Co Cambridge | |
| 2 | 23 | George Jones | 15 | Harlow Pen | |
| 3 | 25 | Finlay Roberts | 15 | Witham Dolph | |
| 4 | 27 | George Little | 16 | Bedford SS | |
| 5 | 26 | Lazaros Giarenis | 15 | Co Norwich | |
| 6 | 24 | Daniel De Filippo | 15 | Flitwick | |
| 7 | 22 | Louis Brown | 16 | Runnymede | |
| 8 | 20 | Juan Modolell | 16 | Co Cambridge | |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 29 | Callum Welsford | 21 | Deben | |
| 2 | 31 | Thomas Spelman | 17 | Stowmarket | |
| 3 | 33 | Samuel Jeffrey | 17 | Hatfield | |
| 4 | 35 | Finley Pawle | 22 | Leiston | |
| 5 | 34 | Gagan Singh | 18 | Co Peterboro | |
| 6 | 32 | P Gurev-Markovachev | 18 | Co Peterboro | |
| 7 | 30 | Charlie Stanbury | 19 | Potters Bar | |
| 8 | 28 | Samuel Howard | 17 | Hoddesdon | |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 37 | Riley Hall | 17 | Co Cambridge | |
| 2 | 39 | Atikan To | 18 | Ware | |
| 3 | 41 | Finlay Arnup | 17 | Norwich Swan | |
| 4 | 43 | Charlie Ruddell | 15 | teamipswich | |
| 5 | 42 | Ayobami Akindele | 16 | Thurrock | |
| 6 | 40 | Thomas Underdown | 17 | Braintree | |
| 7 | 38 | Robert Elliston | 18 | Braintree | |
| 8 | 36 | Max Thomas | 18 | Flitwick | |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 45 | George Prince | 16 | Putteridge | |
| 2 | 47 | Chun Ho Chan | 15 | Watford SC | |
| 3 | 49 | Callum Davis | 24 | Bishop Stort | |
| 4 | 51 | Rhys Burrell | 17 | West Norfolk | |
| 5 | 50 | Matthew Gray | 24 | Co Peterboro | |
| 6 | 48 | Jack Webb | 16 | Witham Dolph | |
| 7 | 46 | Luka Gnjatovic | 17 | Biggleswade | |
| 8 | 44 | Austin Harrop | 18 | Co Cambridge | |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 53 | Szymon Pierzecki | 15 | Witham Dolph | |
| 2 | 55 | Harvey Durham | 16 | Co Norwich | |
| 3 | 57 | Charlie McKinnon | 17 | St Felix Sch | |
| 4 | 59 | Samuel Winslow | 17 | Co Cambridge | |
| 5 | 58 | Austin Everitt | 18 | Norwich Swan | |
| 6 | 56 | James McGettigan | 15 | Thurrock | |
| 7 | 54 | Jeffrey Gill | 17 | Watford SC | |
| 8 | 52 | Thomas Liddiard | 18 | Ware | |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 61 | Joseph Bavey | 19 | Newmarket | |
| 2 | 63 | George Lovelock | 19 | Hitchin | |
| 3 | 65 | Sam Mead | 22 | Linslade | |
| 4 | 67 | Lucas Hartley | 17 | Hatfield | |
| 5 | 66 | Ben Buckley | 17 | Co Norwich | |
| 6 | 64 | Matthew McLaughlin | 31 | DunmowAtlant | |
| 7 | 62 | Josh Martin | 18 | Co Peterboro | |
| 8 | 60 | Christopher Howe | 19 | Co Cambridge | |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 71 | Billy Mead | 19 | Linslade | |
| 2 | 77 | Reece Burns | 16 | Chelmsford | |
| 3 | 83 | Lewis Marston | 22 | Runnymede | |
| 4 | 89 | Freddie Laws | 21 | West Norfolk | |
| 5 | 86 | Daryl Rands | 27 | Colchester | |
| 6 | 80 | Lewis Andrews | 17 | Norwich Swan | |
| 7 | 74 | Harrison Holmes | 19 | Team Waveney | |
| 8 | 68 | Andrea Agius | 29 | Newmarket | |
| Heat Number - 11 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 72 | William Presland | 19 | Bushey | |
| 2 | 78 | Maddox Roberts | 18 | Witham Dolph | |
| 3 | 84 | Edward Ormsby | 17 | Co Cambridge | |
| 4 | 90 | Thomas Hamilton | 23 | Co Cambridge | |
| 5 | 87 | Austin Lillywhite | 21 | Biggleswade | |
| 6 | 81 | Glennon Lee | 18 | Harlow Pen | |
| 7 | 75 | James Noble | 22 | Norwich Swan | |
| 8 | 69 | Jack Renouf | 18 | Hoddesdon | |
| Heat Number - 12 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 73 | Daniel Holliss | 18 | Co St Albans | |
| 2 | 79 | Lewis Chapman | 23 | Stowmarket | |
| 3 | 85 | Saxon Minto | 16 | Chelmsford | |
| 4 | 91 | Olivier Vedrenne | 19 | Co Norwich | |
| 5 | 88 | Finlay Ryan | 25 | West Norfolk | |
| 6 | 82 | Joshua Sackree | 16 | Co Peterboro | |
| 7 | 76 | Timon Chapman | 22 | Norwich Swan | |
| 8 | 70 | Daniel Boboye | 17 | DunmowAtlant | |